JP2008002946A - Rotation information detecting device, and image forming apparatus - Google Patents
Rotation information detecting device, and image forming apparatus Download PDFInfo
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本発明は、回転軸に設けられ、回転軸の回転情報を検出するための位置情報を形成した回転情報形成部材と、前記位置情報を読み取り、前記回転情報形成部材の回転情報を検出する検出手段とを備えた回転情報検出装置に係り、特に、回転情報形成部材に対して高精度で検出手段を配置することができる回転情報検出装置及びこれを備えた画像形成装置に関する。 The present invention provides a rotation information forming member provided on a rotation shaft and formed with position information for detecting rotation information of the rotation shaft, and detection means for reading the position information and detecting rotation information of the rotation information formation member. In particular, the present invention relates to a rotation information detection device capable of arranging detection means with high accuracy with respect to a rotation information forming member, and an image forming apparatus including the rotation information detection device.
電子写真方式により、画像形成を行う複写機、プリンタ、ファクシミリ等の画像形成装置の感光体ドラムの駆動部にあっては、感光体ドラムの回転速度変動を極力小さく抑えるために、感光体ドラムの駆動軸に回転情報検出装置としてスリット円板を設け、検出した速度変動データに基づき、駆動源の速度制御を行うようにしている。このような、回転情報検出装置は、前記感光体ドラムに限らず、画像形成装置の中で、回転速度変動を抑制すべき回転部材に適用される。 In the electrophotographic photosensitive drum driving unit of an image forming apparatus such as a copying machine, a printer, or a facsimile machine that performs image formation, in order to suppress fluctuations in the rotational speed of the photosensitive drum as much as possible, A slit disk is provided as a rotation information detection device on the drive shaft, and the speed control of the drive source is performed based on the detected speed fluctuation data. Such a rotation information detecting device is not limited to the photosensitive drum, but is applied to a rotating member in which fluctuations in rotation speed should be suppressed in the image forming apparatus.
また、このような回転情報検出装置は、画像形成装置に限らず、様々な産業分野において、回転部材の速度変動を低減するために設けられ、回転情報検出装置で検出した速度変動データに基づき、駆動源の速度制御を行う構成を有する装置に適用されている。 Further, such a rotation information detection device is not limited to an image forming device, and is provided in various industrial fields to reduce the speed variation of the rotation member. Based on the speed variation data detected by the rotation information detection device, The present invention is applied to an apparatus having a configuration for controlling the speed of a drive source.
このような、回転情報検出装置として、以下のものがある。特許文献1には回転軸に嵌合する円板状に形成され、周方向に沿って複数の検出パターンが配列された回転部材と、この回転部材と非接触の状態で上記検出パターンを読み出すパターン検出素子とから構成されるスリット円板を上記回転軸に組み付けるための組立構造であって、上記回転部材と、上記パターン検出素子と、上記パターン検出素子が固定される取付基板と、上記回転部材を覆うようにして上記取付基板に固定される保持器とから構成され、上記回転部材の軸方向の一端には環状段部を形成する一方、上記保持器にはこの環状段部に遊嵌する規制孔を形成し、また、上記取付基板には当該取付基板と上記回転部材との間に所定の間隙を形成すると共に上記環状段部と規制孔との抜けを防止する規制突部を形成したことを特徴とするスリット円板の組立構造が記載されている。 As such a rotation information detection apparatus, there are the following. In Patent Document 1, a rotary member that is formed in a disc shape that fits on a rotary shaft and in which a plurality of detection patterns are arranged along the circumferential direction, and a pattern that reads the detection pattern in a non-contact state with the rotary member. An assembly structure for assembling a slit disk composed of a detection element to the rotation shaft, the rotation member, the pattern detection element, a mounting substrate to which the pattern detection element is fixed, and the rotation member And a cage that is fixed to the mounting substrate so as to cover the annular member, and an annular step is formed at one end in the axial direction of the rotating member, while the cage is loosely fitted to the annular step. A restriction hole is formed, and a predetermined gap is formed on the mounting board between the mounting board and the rotating member, and a restriction protrusion is formed to prevent the annular step portion and the restriction hole from coming off. It is characterized by Assembly structure of a slit circular plate is described.
特許文献2には、円周方向に複数のスリットを形成した回転板に導光体を組み合わせ、回転板を透過した信号用発光素子の放射する光を導光体により偏向して受光素子に入射する光学式スリット円板が記載されている。 In Patent Document 2, a light guide is combined with a rotating plate in which a plurality of slits are formed in the circumferential direction, and light emitted from a signal light emitting element transmitted through the rotating plate is deflected by the light guide to enter the light receiving element. An optical slit disk is described.
特許文献3には、光源手段と、該光源手段からの光束が入射する放射格子を有し相対回転するディスクと、該ディスクの放射格子からの変調光を透過する放射格子を有し前記ディスクに対向配置した平面基板と、該平面基板の放射格子からの変調光を受光する受光手段と、前記光源手段及び前記平面基板及び前記受光手段を固定する本体ユニットと、前記ディスクを固定したディスクユニットとを有し、前記受光手段からの信号を用いて前記ディスクと前記平面基板との相対回転変位情報を求める回転変位情報検出装置において、前記本体ユニットと前記ディスクユニットを別体とし、前記ディスクユニットにおいて前記ディスクを固定するディスクハブを2体の部品で構成し、該2体の部品を軸方向に相対的に移動可能としたことを特徴とする回転変位情報検出装置が記載されている。 Patent Document 3 discloses a light source means, a disk having a radiation grating on which a light beam from the light source means is incident, a relatively rotating disk, and a radiation grating that transmits modulated light from the radiation grating of the disk. A planar substrate disposed oppositely, a light receiving means for receiving modulated light from a radiation grating of the planar substrate, a light source means, a main body unit for fixing the planar substrate and the light receiving means, and a disk unit for fixing the disk; In a rotational displacement information detecting apparatus for obtaining relative rotational displacement information between the disk and the planar substrate using a signal from the light receiving means, the main body unit and the disk unit are separated, and the disk unit The disk hub for fixing the disk is composed of two parts, and the two parts can be moved relatively in the axial direction. Rotational displacement information detection apparatus is described that.
特許文献4には、回転軸に装着されて回転駆動されるディスクを備え、ディスクの外周近傍の面には等ピッチによってマーキングが施され、マーキングの施工位置とは異なるディスク中心寄りの位置に、ディスクの中心を挟んで対向する穴あるいは突起部で構成された把持部を設け、回転軸から抜き取る際にマーキングに接触しない構成とするとともに、マーキングへの塵埃の付着を防止する構成を備えたものが記載されている。 Patent Document 4 includes a disk that is mounted on a rotary shaft and is driven to rotate. Marking is performed on the surface in the vicinity of the outer periphery of the disk at an equal pitch. Provided with a gripping part composed of holes or protrusions facing each other across the center of the disk so that it does not come into contact with the marking when it is extracted from the rotating shaft, and has a structure that prevents dust from adhering to the marking Is described.
特許文献5には、モータの回転力で回転駆動される回転体と、回転体の回転軸を中心に環状に配設された複数の被検出部と、被検出部を検出する検出器と、被検出部のうちの2つの被検出部を両端に有する第1の区間と、両端に被検出部を有するとともに少なくとも一端は第1の区間の被検出部とは異なる第2の区間とが設定されているとき、回転体の回転時に、第1の区間と第2の区間が検出器を通過する通過時間を検出器からの信号に基づいて検出する通過時間検出手段と、通過時間検出手段で検出された通過時間に基づいて、回転体の所望周期に関する回転周期変動の振幅と位相を生成する振幅位相生成手段と、振幅位相生成手段で生成された振幅と位相に基づき、回転周期変動を低減するようにモータの回転を制御する回転制御手段とを備えたも回転体駆動制御装置が記載されている。 Patent Document 5 discloses a rotating body that is rotationally driven by the rotational force of a motor, a plurality of detected portions that are annularly arranged around the rotation axis of the rotating body, a detector that detects the detected portions, A first section having two of the detected parts at both ends and a second section having the detected parts at both ends and at least one end different from the detected section of the first section are set. When the rotating body rotates, the passage time detecting means for detecting the passage time during which the first section and the second section pass through the detector based on the signal from the detector, and the passage time detecting means Amplitude phase generation means for generating the amplitude and phase of the rotation period fluctuation related to the desired period of the rotating body based on the detected transit time, and the rotation period fluctuation is reduced based on the amplitude and phase generated by the amplitude phase generation means Rotation control means for controlling the rotation of the motor It has been described also rotary body drive control device comprising a.
ところで、上述した電子写真方式の画像形成装置では、感光体の表面を一様な電位となるように帯電し、形成する画像情報に基づき画像部、非画像部とを分けて、露光装置により感光体表面を露光することにより、静電潜像を形成する。感光体表面上の静電潜像の画像部には、現像装置によりトナーを付着させられ、トナー像(顕像)を形成される。トナー像はその後、転写部で、用紙に転写され、用紙が定着部を通過することにより、トナーが溶融され、用紙上に定着される。このような工程により用紙に画像が形成される。 By the way, in the above-described electrophotographic image forming apparatus, the surface of the photosensitive member is charged so as to have a uniform potential, and the image portion and the non-image portion are separated based on the image information to be formed, and the photosensitive device is exposed by the exposure device. An electrostatic latent image is formed by exposing the body surface. Toner is attached to the image portion of the electrostatic latent image on the surface of the photoreceptor by a developing device to form a toner image (a visible image). Thereafter, the toner image is transferred to a sheet by a transfer unit, and the toner is melted and fixed on the sheet by passing the sheet through the fixing unit. An image is formed on a sheet by such a process.
このような工程で、様々な構成要素が所定の速度で駆動されているが、中でも感光体表面の速度が一定であることが重要となる。感光体表面の速度が一定でないと、露光部、転写部において、画像の伸び縮みが生じることになる。感光体はベルト状の場合もあるが、図示のように、ドラム形状である場合が多く、ドラム形状の場合には、その回転速度に変動の無いことが重要となる。 In such a process, various components are driven at a predetermined speed, but it is important that the speed of the photoreceptor surface is constant. If the speed of the surface of the photoreceptor is not constant, the image is stretched and contracted in the exposed area and the transferred area. Although the photoconductor may be in the form of a belt, as shown in the drawing, the photoconductor is often in the form of a drum.
特に、近年のカラー複写機、プリンタでは、シアン、マゼンタ、イエロー、ブラックの4色でカラー画像を形成しており、画像形成路上に、各色のトナー像を形成するための4本の感光体ドラムを並べる方式(以下、タンデム方式)が主流となっている。感光体ドラムが1本で、その周囲に各色の現像器を4器並べ、感光体ドラム上に1色のトナー像を形成するたびに、中間転写ベルト上にトナー像を移動させ、中間転写ベルト上で4色のトナー像を重ねた後、4色からなるトナー像を1度に用紙に転写する方式も存在するが、画像形成の生産性の面から、現在のカラー画像形成装置においては、タンデム方式が占める割合が多い。 Particularly, in recent color copying machines and printers, color images are formed with four colors of cyan, magenta, yellow and black, and four photosensitive drums for forming toner images of the respective colors on the image forming path. The method of arranging the two (hereinafter referred to as tandem method) has become the mainstream. There is one photosensitive drum, and four developing devices of each color are arranged around it, and each time a toner image of one color is formed on the photosensitive drum, the toner image is moved onto the intermediate transfer belt. Although there is a method in which the toner images of four colors are transferred to the paper at once after the toner images of four colors are overlaid on the above, in the current color image forming apparatus, from the viewpoint of image formation productivity, The proportion of tandem methods is large.
タンデム方式の各感光体ドラムに速度変動がある場合には、別々の色が本来合わさっているべき部分で、色が合わずに形成される「色ズレ」という不具合が生じてしまう。 When there is a speed variation in each tandem photosensitive drum, there is a problem of “color misalignment” in which different colors are originally formed at portions where the colors should be combined.
1色だけで画像を形成する場合には認識され難い程度の画像の伸び縮みであっても、4色の画像を重ねる場合、合わさるべき色が合っていない「色ズレ」は認識されやすい。明確にずれていると認識されない程度のズレ量であっても、画像の濃淡や、色のムラとなって現れてしまう。 Even when the image is stretched and contracted to the extent that it is difficult to recognize when an image is formed with only one color, “color shift” in which the colors to be combined do not match is easily recognized when the images of four colors are overlapped. Even if the amount of misalignment is such that it is not recognized that it is clearly deviated, it will appear as shading of the image and color unevenness.
従って、感光体の回転速度の変動を抑え、一定速度で駆動することは画像品質を良好に維持するために重要である。 Therefore, it is important to suppress fluctuations in the rotational speed of the photoconductor and drive at a constant speed in order to maintain good image quality.
感光体ドラムの回転速度を一定にするための技術としては、感光体ドラムを駆動する軸上に、周方向に一定間隔でパターンを設けた円板状の部材であるスリット円板を設け、上記パターンの通過を光学的に検知する検出素子(センサ)を設け、パターン個々の通過時間を検出することにより、感光体ドラム駆動軸の回転速度を検出し、検出した速度変動を打ち消すように、モータ等の駆動源を制御することで、感光体ドラムの回転速度を一定に維持する方式が一般的である。 As a technique for making the rotation speed of the photosensitive drum constant, a slit disk, which is a disk-shaped member provided with a pattern at regular intervals in the circumferential direction, is provided on the shaft for driving the photosensitive drum, A detection element (sensor) that optically detects the passage of the pattern is provided, and by detecting the passage time of each pattern, the rotational speed of the photosensitive drum drive shaft is detected, and the motor is arranged to cancel the detected speed fluctuation. In general, a method of maintaining the rotational speed of the photosensitive drum constant by controlling a drive source such as the above.
感光体駆動軸に生じる速度変動の要因としては、感光体駆動軸に大径のギヤを嵌合し、モータ軸に設けた小径ギヤを上記感光体駆動軸の大径ギヤに噛合せて、モータ回転速度を減速して、感光体駆動軸を駆動するという代表的な構成の場合、モータ軸1回転周期の速度変動と、感光体軸1回転の速度変動によるものが大きい。モータ軸1回転周期の速度変動は、モータ軸の偏心や、モータ軸に設けたギヤの累積ピッチ誤差等により生じ、感光体軸1回転の速度変動は、大径ギヤの偏心や、ギヤの累積ピッチ誤差等により生じるが、これらの成分を抑えることで、感光体の速度変動を低減する効果が大きい。 As a factor of the speed fluctuation generated in the photosensitive member driving shaft, a large-diameter gear is fitted to the photosensitive member driving shaft, and a small-diameter gear provided on the motor shaft is engaged with the large-diameter gear of the photosensitive member driving shaft. In the case of a typical configuration in which the rotational speed is decelerated and the photosensitive member drive shaft is driven, a large amount is caused by a speed fluctuation in one rotation cycle of the motor shaft and a speed fluctuation in one rotation of the photosensitive member shaft. The speed fluctuation in one rotation period of the motor shaft is caused by the eccentricity of the motor shaft or the accumulated pitch error of the gear provided on the motor shaft, and the speed fluctuation of one rotation of the photoreceptor shaft is caused by the eccentricity of the large diameter gear or the cumulative gear. Although it occurs due to a pitch error or the like, suppressing these components has a great effect of reducing the speed fluctuation of the photoreceptor.
即ち、スリット円板上のパターンは、周方向に、多数であるほど、分解能が高く、回転速度を高精度に検出可能であるが、特許文献5に記載のものでは、検出対象を、上記、感光体1回転周期の速度変動とモータ1回転周期の速度変動に絞り、安価な構成で、感光体ドラムの速度変動を低減することを可能としている。 That is, as the number of patterns on the slit disk is larger in the circumferential direction, the resolution is higher and the rotation speed can be detected with higher accuracy. It is possible to reduce the speed fluctuation of the photosensitive drum with an inexpensive configuration by focusing on the speed fluctuation of one rotation cycle of the photosensitive member and the speed fluctuation of one rotation cycle of the motor.
しかし、このようなスリット円板構成により回転速度を検出する際に、重要となるのが、スリット円板、及び、センサの取付精度である。スリット円板のパターン形成部分は円板状部材であり、取り付けるべき駆動軸に対しては、軸に嵌合する円筒状部材とその周方向に突き出た鍔状部材を設けた部材を介して取り付ける。軸と円筒部分、円筒部分とスリット円板上のパターンに関して、それぞれの回転中心が一致することが理想である。それでも、駆動軸回転中心とスリット円板パターンの中心の同軸度を0にすることはできず、いくらかの偏心は生じてしまうが、偏心による精度劣化は、検出部材(センサ)を2個用い、軸心に対して対称の位置に設けて検出することで、相殺することが可能である。 However, when detecting the rotational speed by such a slit disk configuration, the accuracy of mounting the slit disk and the sensor is important. The pattern forming portion of the slit disk is a disk-like member, and is attached to the drive shaft to be attached via a member provided with a cylindrical member fitted to the shaft and a hook-like member protruding in the circumferential direction. . Ideally, the rotation centers of the shaft and the cylindrical portion and the cylindrical portion and the pattern on the slit disk coincide with each other. Still, the coaxiality between the drive shaft rotation center and the center of the slit disk pattern cannot be reduced to 0, and some eccentricity occurs, but the accuracy deterioration due to the eccentricity uses two detection members (sensors), It is possible to cancel by providing the detection at a symmetrical position with respect to the axis.
但し、2個のセンサの回転中心からの距離が極力等しくすること、即ち、センサ取付精度が重要になってくる。センサの取付精度は、センサの発光素子と受光素子の中心同士を結んだ線(光軸)、即ちセンサ検出位置と、スリット円板上のパターンとの位置関係が重要である。センサ読み取り位置の半径が変われば、読み取り周長が変わり、ひいては、パターン通過時間が変わるため、回転速度を誤検出することになる。従って、駆動軸中心からセンサまでの距離を高精度に確保する必要がある。 However, it is important that the distances from the rotation centers of the two sensors are as equal as possible, that is, the sensor mounting accuracy. For the sensor mounting accuracy, the positional relationship between the line (optical axis) connecting the centers of the light emitting element and the light receiving element of the sensor, that is, the sensor detection position, and the pattern on the slit disk is important. If the radius of the sensor reading position changes, the reading circumference changes, and consequently the pattern passage time changes, so that the rotational speed is erroneously detected. Therefore, it is necessary to ensure the distance from the center of the drive shaft to the sensor with high accuracy.
また、2個のセンサが、駆動軸心に対してなす角度についても、正確に180度であれば問題ないが、その角度が数度ずれれば、回転速度の検出に誤りが生じる。 Also, the angle formed by the two sensors with respect to the drive axis is not a problem if it is exactly 180 degrees, but if the angle is shifted by several degrees, an error occurs in the detection of the rotational speed.
これらの精度が不十分で、回転速度を検出した場合には、そのデータをもとにモータの回転を制御しても、理想どおりの一定の回転速度とは隔たりが生じてしまう。 If the accuracy is insufficient and the rotation speed is detected, even if the rotation of the motor is controlled based on the data, there is a difference from the ideal constant rotation speed.
また、スリット円板、センサを感光体軸周りに組み付ける際にも、特許文献1に記載に記載されているような課題がある。即ち、スリット円板の検出パターンを読み出す検出素子(センサ)は円板状のスリット円板の周縁を跨ぐようにして配設するので、回転部材を先に感光体ドラムの駆動軸に固定してしまったのでは、検出素子を後から感光体ドラムの支持フレームに固定する際に、回転部材と検出素子とが接触してしまう可能性が高く、また、検出素子を先に支持フレームに固定してしまったのでは、回転部材を感光体ドラムの駆動軸に嵌合させつつその周縁を検出手段の中に挿入することは不可能である。 Further, when assembling the slit disk and the sensor around the photosensitive member axis, there is a problem as described in Patent Document 1. That is, since the detection element (sensor) that reads the detection pattern of the slit disk is disposed so as to straddle the periphery of the disk-shaped slit disk, the rotating member is first fixed to the drive shaft of the photosensitive drum. If this happens, there is a high possibility that the rotating element and the detection element will come into contact when the detection element is fixed to the support frame of the photosensitive drum later, and the detection element is fixed to the support frame first. Therefore, it is impossible to insert the periphery of the rotating member into the detecting means while fitting the rotating member to the drive shaft of the photosensitive drum.
従って、スリット円板及び検出素子を互いに位置決めしながら、夫々を感光体ドラムの駆動軸あるいは支持フレームに対して同時に固定する組立作業は非常に煩雑である。 Therefore, it is very complicated to assemble the slit disk and the detection element with respect to each other while simultaneously fixing the slit disk and the detection element to the drive shaft or the support frame of the photosensitive drum.
また、このようなエンコーダの組立作業は手元の作業スペースは小さくならざるを得ず、回転部材や検出素子が組立作業中に周辺機器と接触し、破損を生じる恐れがある。 Further, such an encoder assembly work requires a small work space at hand, and the rotating member and the detection element may come into contact with peripheral devices during the assembly work and may be damaged.
特許文献1に記載のものでは、取付け基板にセンサを組み付け、センサの読み取り部にエンコーダを挟みながら、保持器の中に、センサ、エンコーダを内包しながら、保持器を取付け基板に固定し、これらを一体で組み付けた上で、感光体駆動軸に嵌めていく構成とすることで、組み付けに際して生じる不具合を低減し、組み付け性を向上させている。しかしながら、この構成では、エンコーダに対する、センサの取付け精度を維持するには、不十分である。 In the one described in Patent Document 1, the sensor is assembled to the mounting board, the encoder is sandwiched between the sensor reading units, the sensor and the encoder are contained in the cage, and the cage is fixed to the mounting board. By assembling them together and then fitting them onto the photosensitive member drive shaft, problems that occur during assembly are reduced and the assembly is improved. However, this configuration is insufficient to maintain the sensor mounting accuracy with respect to the encoder.
そこで、本発明は、容易に組み立て組み付けができ回転板に対して高精度で検出手段を配置することができる回転情報検出装置及びこれを備えた画像形成装置を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a rotation information detection device that can be easily assembled and assembled and can dispose detection means with high accuracy with respect to a rotating plate, and an image forming apparatus including the rotation information detection device.
請求項1の発明は、回転軸に設けられ、回転軸の回転情報を検出するための位置情報を形成した回転情報形成部材と、前記位置情報を読み取り、前記回転情報形成部材の回転情報を検出する検出手段と、前記回転軸に直接又は軸受を介して嵌合する嵌合基部及び前記検出手段を支持する支持部を一体に備える検出手段支持部材と、を有することを特徴とする回転情報検出装置である。 According to a first aspect of the present invention, there is provided a rotation information forming member provided on the rotation shaft and forming position information for detecting rotation information of the rotation shaft, and the position information is read and rotation information of the rotation information forming member is detected. Rotational information detection, comprising: a detecting means for detecting, a detecting base supporting member integrally including a fitting base portion that is fitted to the rotating shaft directly or via a bearing and a supporting portion for supporting the detecting means. Device.
請求項2の発明は、請求項1記載の回転情報検出装置において、前記検出手段支持部材には、前記検出手段に係合して検出手段の位置を規制して保持する検出手段保持部を備えたことを特徴とする。 According to a second aspect of the present invention, in the rotation information detection device according to the first aspect, the detection means supporting member includes a detection means holding portion that engages with the detection means and restricts and holds the position of the detection means. It is characterized by that.
請求項3の発明は、請求項1又は2記載の回転情報検出装置において、検出手段支持部材は、ポリアセタール樹脂を含む合成樹脂で形成したことを特徴とする。 According to a third aspect of the present invention, in the rotation information detecting device according to the first or second aspect, the detection means supporting member is formed of a synthetic resin containing a polyacetal resin.
請求項4の発明は、請求項1乃至3のいずれか記載の回転情報検出装置において、回転情報形成部材は、回転情報形成部材を回転軸とともに回転するべく回転軸に結合する連結部材を備え、連結部材の回転軸への取付け穴の開口部には勾配を形成したことを特徴とする。 According to a fourth aspect of the present invention, in the rotation information detecting device according to any one of the first to third aspects, the rotation information forming member includes a connecting member coupled to the rotation shaft so as to rotate the rotation information forming member together with the rotation shaft. A gradient is formed in the opening of the attachment hole to the rotation shaft of the connecting member.
請求項5の発明は、請求項1乃至4のいずれか記載の回転情報検出装置において、前記検出手段支持部材と組み合わされ、検出手段支持部材との間に前記検出手段と前記回転情報形成部材を内包するケーシング部材を備え、前記ケーシング部材と回転軸との間に所定間隔の隙間を備え、前記連結部材の一部を回転軸とケーシング部材の隙間より突出させ、連結部材の突出した部分において、連結部材を回転軸に固定することを特徴とする。 According to a fifth aspect of the present invention, in the rotation information detection device according to any one of the first to fourth aspects, the detection means and the rotation information forming member are combined with the detection means support member in combination with the detection means support member. Including a casing member to enclose, provided with a gap of a predetermined interval between the casing member and the rotating shaft, protruding a part of the connecting member from the gap between the rotating shaft and the casing member, in the protruding portion of the connecting member, The connecting member is fixed to the rotating shaft.
請求項6の発明は、請求項1乃至5のいずれか記載の回転情報検出装置において、検出手段支持部材、ケーシング部材の一方、あるいは両方に、被回転情報検出部材又は、連結部材の軸方向の位置を規制する凸部を設けたことを特徴とする。 According to a sixth aspect of the present invention, in the rotation information detecting device according to any one of the first to fifth aspects, the rotation information detecting member or the connecting member in the axial direction is provided on one or both of the detecting means supporting member and the casing member. It is characterized in that a convex portion for regulating the position is provided.
請求項7の発明は、請求項1乃至6のあるいずれか記載の回転情報検出装置において、前記検出手段を、回転軸の法線方向から、検出手段支持部材、又は検出手段支持部材とケーシング部材に対して着脱可能としたことを特徴とする。 According to a seventh aspect of the present invention, in the rotation information detecting device according to any one of the first to sixth aspects, the detecting means is a detecting means supporting member or a detecting means supporting member and a casing member from the normal direction of the rotating shaft. It is characterized in that it can be attached to and detached from.
請求項8の発明は、請求項1乃至7のいずれか記載の回転情報検出装置において、検出手段支持部材、ケーシング部材の一方、あるいは両方一部又は全てを透明材料で形成したことを特徴とする。 The invention according to claim 8 is the rotational information detection device according to any one of claims 1 to 7, wherein one or both of the detection means support member and the casing member are formed of a transparent material. .
請求項9の発明は、請求項1乃至8のいずれか記載の回転情報検出装置において、前記検出手段の入力/出力の信号線の結合部を、検出手段支持部材、又はケーシング部材に設けたことを特徴とする。 The ninth aspect of the present invention is the rotation information detecting device according to any one of the first to eighth aspects, wherein the detecting / supporting signal line coupling portion of the detecting means is provided on the detecting means supporting member or the casing member. It is characterized by.
請求項10の発明は請求項1乃至10のいずれか記載の回転情報検出装置を備えた、ことを特徴とする画像形成装置である。 A tenth aspect of the present invention is an image forming apparatus comprising the rotation information detecting device according to any one of the first to tenth aspects.
本発明に係る回転情報検出装置によれば、検出手段を検出手段支持部材に配置できるので、検出手段を回転情報形成部材に対して容易且つ高精度で配置することができるという効果がある。 According to the rotation information detection device of the present invention, since the detection means can be arranged on the detection means support member, there is an effect that the detection means can be easily and highly accurately arranged with respect to the rotation information forming member.
また、本発明に係る画像形成装置によれば、画像形成装置内に配置される回転体の回転を高精度で検出することができるので回転体の回転制御を高精度で行うことができ、安定した画像形成を行うことができるという効果がある。 In addition, according to the image forming apparatus of the present invention, the rotation of the rotating body arranged in the image forming apparatus can be detected with high accuracy, so that the rotation control of the rotating body can be performed with high accuracy and stable. There is an effect that the formed image can be formed.
以下本発明を実施するための最良の形態としての実施例を図面に基づいて説明する。 Embodiments as the best mode for carrying out the present invention will be described below with reference to the drawings.
以下本発明の実施例に係る回転情報検出装置の構成を図1乃至図5に基づいて説明する。図1は第1の実施例に係る回転情報検出装置の構造を示す断面図、図2は図1に示した回転情報検出装置の構造を示す拡大断面図、図3は図1に示した回転情報検出装置の構造を示す分解斜視図である。 Hereinafter, the configuration of the rotation information detecting apparatus according to the embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing the structure of the rotation information detecting device according to the first embodiment, FIG. 2 is an enlarged cross-sectional view showing the structure of the rotation information detecting device shown in FIG. 1, and FIG. 3 is the rotation shown in FIG. It is a disassembled perspective view which shows the structure of an information detection apparatus.
本例では、回転情報検出装置100は、画像形成装置の感光体ドラム1駆動用の回転軸である駆動軸101に取付けられている。感光体ドラム1は、駆動軸101により装置枠体支持されており、駆動軸101は、画像形成装置本体のベース部である筺体10に対して、軸受部材である玉軸受102で支持されている。 In this example, the rotation information detection device 100 is attached to a drive shaft 101 that is a rotation shaft for driving the photosensitive drum 1 of the image forming apparatus. The photosensitive drum 1 is supported by an apparatus frame by a drive shaft 101, and the drive shaft 101 is supported by a ball bearing 102 that is a bearing member with respect to a housing 10 that is a base portion of the image forming apparatus main body. .
また、本例では、駆動軸101の左端は図示していないが、右端と同じように玉軸受により画像形成装置本体に支持されている。本例では、駆動軸101の端部には、大径ギヤ106が取付けられており、この大径ギヤ106は、駆動源であるモータ103の駆動軸に設けられたピニオンギヤ104と噛合い、モータの回転により大径ギヤ106、駆動軸101、感光体ドラム1が回転駆動される。なお、モータ103及びピニオンギヤ104は筺体10に固定されたモータブラケット105に配置されている。 In this example, the left end of the drive shaft 101 is not shown, but is supported on the image forming apparatus main body by a ball bearing in the same manner as the right end. In this example, a large-diameter gear 106 is attached to the end of the drive shaft 101, and this large-diameter gear 106 meshes with a pinion gear 104 provided on the drive shaft of the motor 103 that is a drive source. The large-diameter gear 106, the drive shaft 101, and the photosensitive drum 1 are rotationally driven by this rotation. The motor 103 and the pinion gear 104 are arranged on a motor bracket 105 fixed to the housing 10.
駆動ブラケット11は、感光体以外の画像形成要素を駆動する部材(図示していない)の支持体であり、画像形成装置本体の筺体にネジ止め等で固定されている。モータ103を支持するモータブラケット105は、画像形成装置本体の筺体10、あるいは、駆動ブラケット11に対して、ネジ130aで固定される。本例では、回転情報検出装置100は駆動ブラケット11とモータブラケット105の間に配置されている。 The drive bracket 11 is a support for a member (not shown) that drives an image forming element other than the photosensitive member, and is fixed to the housing of the image forming apparatus main body by screws or the like. The motor bracket 105 that supports the motor 103 is fixed to the housing 10 of the image forming apparatus main body or the drive bracket 11 with screws 130a. In this example, the rotation information detection device 100 is disposed between the drive bracket 11 and the motor bracket 105.
以下本例に係る回転情報検出装置100について説明する。本例では、回転情報検出装置100は、図3に示すように、検出手段支持部材114とケーシング部材115とから構成されるケーシング120内に、回転情報形成部材であるスリット円板110を連結部材111を介して駆動軸101に固定することにより配置して、スリット円板110に形成されたスリット121をケーシング120に配置された検出手段であるセンサ113で検出して、駆動軸101の回転情報を検出する。 Hereinafter, the rotation information detection apparatus 100 according to this example will be described. In this example, as shown in FIG. 3, the rotation information detection device 100 includes a slit disk 110 that is a rotation information forming member in a casing 120 that includes a detection means support member 114 and a casing member 115. Rotation information of the drive shaft 101 is detected by detecting the slit 121 formed in the slit disk 110 by a sensor 113 which is a detection means disposed in the casing 120. Is detected.
本例では、検出手段支持部材114内に、連結部材111及び押え部材112を取付けたスリット円板110を組み付け、更にモータブラケット105を取付け、更に、センサ113を検出手段支持部材114とケーシング部材115で形成されるケーシング120に組み付ける。この組み上がった回転情報検出装置100に駆動軸101を挿入しつつ駆動ブラケット11にネジ130aで取付けるものである。 In this example, the slit disk 110 having the connecting member 111 and the pressing member 112 attached thereto is assembled in the detection means support member 114, the motor bracket 105 is further attached, and the sensor 113 is connected to the detection means support member 114 and the casing member 115. Assembled to the casing 120 formed in The drive shaft 101 is inserted into the assembled rotation information detecting device 100 and attached to the drive bracket 11 with screws 130a.
次に検出手段支持部材114について説明する。検出手段支持部材114は、摺動性のよい合成樹脂例えばPOM樹脂で構成されており、全体あるいは一部を透明に形成することができる。検出手段支持部材114を透明としておくと、組み立て時に、それぞれの部材の位置を確認しながら行うことができるので作業性が向上すると共に、組み付け後や、稼動途中で、異常の有無を確認することが容易になる。 Next, the detection means support member 114 will be described. The detection means support member 114 is made of a synthetic resin with good slidability, such as a POM resin, and can be formed entirely or partially transparent. If the detection means support member 114 is made transparent, it can be performed while checking the position of each member at the time of assembly, so that workability is improved and whether or not there is an abnormality after assembly or during operation is checked. Becomes easier.
また、その検出手段支持部材114はその略中央部において、駆動軸101が貫通するように軸貫通部114dが形成され、駆動軸101は、この軸貫通部114dに貫通するよう配置される。なお、軸貫通部114dには、駆動軸101の挿入を容易にするテーパ部114fが形成されている。 Further, the detection means supporting member 114 is formed with a shaft penetrating portion 114d so that the driving shaft 101 penetrates at a substantially central portion thereof, and the driving shaft 101 is disposed so as to penetrate the shaft penetrating portion 114d. The shaft penetrating portion 114d is formed with a tapered portion 114f that facilitates insertion of the drive shaft 101.
また、検出手段支持部材114には、検出手段の外形を嵌め込み固定するセンサ係合部114aが形成されている。このセンサ係合部114aにセンサ113を嵌め込んで係合することで、センサ113を位置決め固定でき、センサ113の精度よく配置することができる他、センサ113のネジ止め等の手間を省くことができ、部品点数を低減することができる。 The detecting means support member 114 is formed with a sensor engaging portion 114a for fitting and fixing the outer shape of the detecting means. By fitting and engaging the sensor 113 with the sensor engaging portion 114a, the sensor 113 can be positioned and fixed, and the sensor 113 can be arranged with high accuracy, and the trouble such as screwing of the sensor 113 can be saved. And the number of parts can be reduced.
また、検出手段支持部材114には、スリット円板110側に向け環状の凸部114bを設けており、スリット円板110を支持する前記連結部材111の半径方向の位置を規制している。凸部114bと連結部材111には一定の隙間を有し、スリット円板110、連結部材111は、ケーシング部材に対して、ある程度余裕を持って、ケーシング部材に保持された状態で、駆動軸101に嵌合される。 Further, the detection means support member 114 is provided with an annular convex portion 114b toward the slit disk 110 side, and the radial position of the connecting member 111 that supports the slit disk 110 is restricted. The projecting portion 114b and the connecting member 111 have a certain clearance, and the slit disk 110 and the connecting member 111 have a certain margin with respect to the casing member and are held by the casing member in a state where they are held by the driving shaft 101. Fitted.
本例では、検出手段支持部材114と、この検出手段支持部材114を貫通して配置される駆動軸101とは摺動して接触することになる。本例では、検出手段支持部材114をPOM樹脂で形成するものとしている。このため、検出手段支持部材114と駆動軸101との摺動抵抗は少ないものとできる。 In this example, the detection means support member 114 and the drive shaft 101 disposed through the detection means support member 114 are in sliding contact. In this example, the detection means support member 114 is formed of POM resin. For this reason, the sliding resistance between the detection means support member 114 and the drive shaft 101 can be reduced.
画像形成速度が速く駆動軸101の回転が速い場合には、検出手段支持部材114は軸受部材を介して、駆動軸を介在させる構成とすることで無理な負荷が生じることを避けることができる。軸受部材は、具体的には、玉軸受、滑り軸受など、駆動軸の速度に応じて選択すればよい。 When the image forming speed is high and the rotation of the drive shaft 101 is fast, the detection means support member 114 is configured to interpose the drive shaft via the bearing member, so that an excessive load can be avoided. Specifically, the bearing member may be selected according to the speed of the drive shaft, such as a ball bearing or a sliding bearing.
次にスリット円板110について説明する。スリット円板110は連結部材111と押え部材112とで駆動軸101に取付けられる。スリット円板110は、円板形状をなした金属の薄板であり、その外周寄りに、周方向に所定間隔のスリット121でパターンが形成してある。本例ではそれぞれのスリット121の通過時間をセンサ113により検出することで、スリット円板110の回転速度を検出することができ、この結果、駆動軸101、感光体ドラム1の回転速度を検出することができる。 Next, the slit disk 110 will be described. The slit disk 110 is attached to the drive shaft 101 by a connecting member 111 and a pressing member 112. The slit disk 110 is a thin metal plate having a disk shape, and is formed with slits 121 at predetermined intervals in the circumferential direction near the outer periphery thereof. In this example, the passage time of each slit 121 is detected by the sensor 113, whereby the rotation speed of the slit disk 110 can be detected. As a result, the rotation speed of the drive shaft 101 and the photosensitive drum 1 is detected. be able to.
本例では、スリット円板110は、金属薄板にスリット121を設けることでパターンを形成しているが、透明の薄板部材に光を透過しない色でパターンを書き込むことで形成することができる。 In this example, the slit disk 110 forms the pattern by providing the slit 121 on the metal thin plate, but can be formed by writing the pattern in a color that does not transmit light to the transparent thin plate member.
本例では、スリット円板110が薄板金属部材としているため、スリット円板110を駆動軸101に直接固定することができない。そのため、本例では、スリット円板110は、連結部材111により駆動軸101に固定されている In this example, since the slit disk 110 is a thin metal member, the slit disk 110 cannot be directly fixed to the drive shaft 101. Therefore, in this example, the slit disk 110 is fixed to the drive shaft 101 by the connecting member 111.
次に、連結部材111について説明する。本例では、連結部材111は駆動軸101に嵌合する円筒部111aと周方向に突き出した鍔部111bとを備えている。スリット円板110は、その中央部の穴を連結部材111の円筒部111aの外周に嵌合し、鍔部111bと押え部材112の間で固定するものとしている。 Next, the connecting member 111 will be described. In this example, the connecting member 111 includes a cylindrical portion 111a that is fitted to the drive shaft 101 and a flange portion 111b that protrudes in the circumferential direction. The slit disk 110 is configured such that a hole at the center thereof is fitted to the outer periphery of the cylindrical portion 111 a of the connecting member 111 and is fixed between the flange portion 111 b and the pressing member 112.
本例では、円筒部111aは、ケーシング部材115が組み付けられた状態で、ケーシング部材115の外部に突出する。そして、この突出した円筒部111aにおいてネジ131により駆動軸101に固定される。従って、検出手段支持部材114、連結部材111、ケーシング部材115を組み付け回転情報検出装置100を組み立てた後、駆動軸101を回転情報検出装置100に挿通し、ネジ131を締め付け、連結部材111を駆動軸101に固定することができる。 In this example, the cylindrical portion 111a protrudes outside the casing member 115 in a state where the casing member 115 is assembled. The protruding cylindrical portion 111a is fixed to the drive shaft 101 with a screw 131. Therefore, after assembling the rotation information detection device 100 by assembling the detection means support member 114, the connection member 111, and the casing member 115, the drive shaft 101 is inserted into the rotation information detection device 100, the screw 131 is tightened, and the connection member 111 is driven. It can be fixed to the shaft 101.
ここで、押え部材112は円環板状の部材であり、スリット円板110が連結部材111から浮いたりすることを防止し、スリット円板110の平面性を保つ。本実施例ではスリット円板110と鍔部111b、押え部材112とは、接着により固定しているが、両面テープ、熱溶着、ネジ止め等で固定することができる。また、連結部材111には、連結部材111を駆動軸101に挿入しやすくするため、外方向に拡開したテーパ部111cを形成するものとしている。 Here, the pressing member 112 is an annular plate-like member, which prevents the slit disk 110 from floating from the connecting member 111 and maintains the flatness of the slit disk 110. In the present embodiment, the slit disk 110, the flange 111b, and the pressing member 112 are fixed by adhesion, but can be fixed by double-sided tape, thermal welding, screwing, or the like. Further, the connecting member 111 is formed with a tapered portion 111c that is expanded outward in order to facilitate the insertion of the connecting member 111 into the drive shaft 101.
次にセンサ113について説明する。センサ113は光学的にパターンを検出するものであり、本実施例では、センサ113は、発光素子と受光素子とを備え、その間が遮光されるか否かで物体の通過を検出する透過型のセンサをとしている。本例のような透過型のセンサでは、発光部と受光部とで、スリット円板のパターンを挟むような位置関係に配置する必要がある。 Next, the sensor 113 will be described. The sensor 113 optically detects a pattern. In this embodiment, the sensor 113 includes a light emitting element and a light receiving element, and detects a passage of an object depending on whether or not the light is shielded between them. A sensor. In the transmissive sensor as in this example, it is necessary to arrange the light emitting unit and the light receiving unit in a positional relationship such that the slit disk pattern is sandwiched between them.
本例では、センサ113には、信号線113aが接続され、センサ113からの信号が外部に取り出されるようになっている。 In this example, a signal line 113a is connected to the sensor 113, and a signal from the sensor 113 is extracted to the outside.
また、本実施例では、センサ113は、スリット円板110の取付け偏心による検出誤差を相殺するために、駆動軸回転中心に挟んで対称の位置に2個設けられている。このセンサ113は上述したように検出手段支持部材114のセンサ係合部114aに配置され、ケーシング部材115を被せることにより固定される。なお、センサについては、発光素子と受光素子が、検出パターンに対して同じ方向に位置することが可能な反射型センサを使用することができる。 In the present embodiment, two sensors 113 are provided at symmetrical positions across the drive shaft rotation center in order to cancel out a detection error due to the eccentric mounting of the slit disk 110. As described above, the sensor 113 is disposed on the sensor engaging portion 114a of the detection means support member 114, and is fixed by covering the casing member 115. In addition, about a sensor, the reflection type sensor in which a light emitting element and a light receiving element can be located in the same direction with respect to a detection pattern can be used.
ここで、このような回転情報検出装置100では、スリット円板110に円周方向に形成したスリット121によるパターンの回転中心と、駆動軸心との同軸度は極力一致することが望ましく、駆動軸101、連結部材111、スリット円板110のそれぞれの部材について、上記同軸度に影響する寸法を管理する必要がある。 Here, in such a rotation information detecting device 100, it is desirable that the rotation center of the pattern by the slit 121 formed in the circumferential direction on the slit disk 110 and the coaxiality of the drive axis coincide as much as possible. For each of the members 101, the connecting member 111, and the slit disk 110, it is necessary to manage the dimensions that affect the coaxiality.
次にケーシング部材115について説明する。ケーシング部材115は、検出手段支持部材114にスリット円板110、センサ113をセットした後、スリット円板110、センサ113を覆うように、検出手段支持部材114と組み付けられる。ケーシング部材115は、摺動性のよい合成樹脂例えばPOM樹脂で構成されており、全体あるいは一部を透明に形成することができる。ケーシング部材115を透明としておくと、組み立て時に、それぞれの部材の位置を確認しながら行うことができるので作業性が向上すると共に、組み付け後や、稼動途中で、異常の有無を確認することが容易になる。 Next, the casing member 115 will be described. The casing member 115 is assembled with the detection means support member 114 so as to cover the slit disk 110 and the sensor 113 after the slit disk 110 and the sensor 113 are set on the detection means support member 114. The casing member 115 is made of a synthetic resin having good slidability, for example, a POM resin, and can be formed entirely or partially transparent. If the casing member 115 is made transparent, it can be performed while checking the position of each member at the time of assembly, so that workability is improved and it is easy to check whether there is an abnormality after assembly or during operation. become.
また、ケーシング部材115には、スリット円板110側に向け環状の凸部115aを設けており、スリット円板110を支持する前記連結部材111の半径方向の位置を規制している。凸部115aと押え部材112には一定の隙間を有し、スリット円板110、連結部材111、押え部材112は、ケーシング部材に対して、ある程度ガタを持って、ケーシング部材に保持された状態で、駆動軸101に嵌合される。なお、ケーシング部材115に設けた凸部115aが押え部材112と摺動する場合には、押え部材112を摺動性のよい材質にしておくことが望ましい。 Further, the casing member 115 is provided with an annular convex portion 115a toward the slit disk 110 side, and restricts the position of the connecting member 111 that supports the slit disk 110 in the radial direction. The protrusion 115a and the presser member 112 have a certain gap, and the slit disk 110, the connecting member 111, and the presser member 112 have some backlash with respect to the casing member and are held by the casing member. The drive shaft 101 is fitted. In addition, when the convex part 115a provided in the casing member 115 slides with the presser member 112, it is desirable that the presser member 112 be made of a material having good slidability.
また、そのケーシング部材115はその略中央部において、連結部材111の前記円筒部111aが貫通するように軸貫通部115bが形成されている。 Further, the casing member 115 is formed with a shaft penetrating portion 115b at a substantially central portion thereof so that the cylindrical portion 111a of the connecting member 111 passes therethrough.
以上説明したように、本例に係る回転情報検出装置100によれば、駆動軸101への組み付けの前に、検出手段支持部材114、ケーシング部材115、スリット円板110、センサ113の組み立て、回転情報検出装置100を組み立てればよい。そして、組み立てられた100を、駆動軸101に嵌合させると共に駆動ブラケット11に取付ける。そして、回転情報検出装置100のケーシング部材115から突出する円筒部111aを駆動軸101に取付ければよい。このため、回転情報検出装置100を構成する部材を別々に駆動軸周りに組み付けていく場合よりも作業性を良好にすることができる。 As described above, according to the rotation information detection apparatus 100 according to this example, the assembly and rotation of the detection means support member 114, the casing member 115, the slit disk 110, and the sensor 113 are performed before the assembly to the drive shaft 101. What is necessary is just to assemble the information detection apparatus 100. FIG. Then, the assembled 100 is fitted to the drive bracket 11 while being fitted to the drive shaft 101. Then, the cylindrical portion 111 a protruding from the casing member 115 of the rotation information detecting device 100 may be attached to the drive shaft 101. For this reason, workability | operativity can be made favorable rather than the case where the member which comprises the rotation information detection apparatus 100 is assembled | attached around a drive shaft separately.
そして、駆動軸101を回転情報検出装置100に差し込むとき、検出手段支持部材114の軸貫通部114dにはテーパ部114fが、連結部材111にはテーパ部111cが形成されているので、駆動軸101は容易に回転情報検出装置100内に配置することができる。 When the drive shaft 101 is inserted into the rotation information detecting device 100, the shaft penetrating portion 114d of the detecting means support member 114 is formed with the tapered portion 114f, and the connecting member 111 is formed with the tapered portion 111c. Can be easily arranged in the rotation information detecting apparatus 100.
また、センサ113の受光部は、検出手段支持部材114のセンサ係合部114aに配置するスリット円板110に対して正確な位置に配置することができる。 Further, the light receiving portion of the sensor 113 can be disposed at an accurate position with respect to the slit disk 110 disposed in the sensor engaging portion 114a of the detection means support member 114.
次に本発明に係る回転情報検出装置の第2の実施例について説明する。図4は、本例に係る回転情報検出装置の第2の実施例を示す斜視図である。本例では、センサ係合部114aを検出手段支持部材114、スリット円板110、ケーシング部材115を組み立てた後で、スリット円板110の法線方向から、センサ113を挿入して固定できる構成としたものである。本例によれば、検出手段支持部材114と、ケーシング部材115の組み付け及びセンサ113の取付けが容易なものとなり、回転情報検出装置100の組み立て性は更に良好なものとなる。 Next, a second embodiment of the rotation information detecting apparatus according to the present invention will be described. FIG. 4 is a perspective view showing a second embodiment of the rotation information detecting apparatus according to this example. In this example, the sensor engaging portion 114a can be inserted and fixed from the normal direction of the slit disk 110 after the detection means support member 114, the slit disk 110, and the casing member 115 are assembled. It is a thing. According to this example, the assembly of the detection means support member 114 and the casing member 115 and the attachment of the sensor 113 are facilitated, and the assembly of the rotation information detection device 100 is further improved.
次に本発明に係る回転情報検出装置の第3の実施例について説明する。図5は第3の実施例に係る回転情報検出装置を示す断面図である。 Next, a third embodiment of the rotation information detecting apparatus according to the present invention will be described. FIG. 5 is a sectional view showing a rotation information detecting apparatus according to the third embodiment.
本例は、回転情報検出装置100を画像形成装置本体の筺体10にネジ130bで直接固定するものである。本例では、検出手段支持部材114は、画像形成装置の筺体10に設置される玉軸受102に嵌合するように配置している。また、本例は、センサ113には信号線113aの端部に配置されたコネクタ113bが接続されるソケット113cをセンサ113自体又は、センサ113直近部に設けるものとした。 In this example, the rotation information detecting device 100 is directly fixed to the housing 10 of the image forming apparatus main body with screws 130b. In this example, the detection means support member 114 is disposed so as to be fitted to the ball bearing 102 installed in the housing 10 of the image forming apparatus. Further, in this example, the sensor 113 is provided with a socket 113c to which a connector 113b disposed at the end of the signal line 113a is connected, in the sensor 113 itself or in the immediate vicinity of the sensor 113.
本例によれば、センサ113と信号線113aとを容易に分離接続することができるようになり、回転情報検出装置100を画像形成装置本体に組み付けた後、画像形成装置本体からの信号線のコネクタ113bを、回転情報検出装置表面に配置したソケット113cに接続することで結線が完了するから、回転情報検出装置100からは、信号線113aが飛び出さず回転情報検出装置100の組み立て性が更に良好なものとなる。 According to this example, the sensor 113 and the signal line 113a can be easily separated and connected. After the rotation information detecting apparatus 100 is assembled to the image forming apparatus main body, the signal lines from the image forming apparatus main body are connected. Since the connection is completed by connecting the connector 113b to the socket 113c arranged on the surface of the rotation information detecting device, the signal line 113a does not protrude from the rotation information detecting device 100, and the assembly of the rotation information detecting device 100 is further improved. It will be good.
1・・・感光体ドラム
10・・・筺体
11・・・駆動ブラケット
100・・・回転情報検出装置
101・・・駆動軸(回転軸)
102・・・玉軸受(軸受)
103・・・モータ
104・・・ピニオンギヤ
105・・・モータブラケット
106・・・大径ギヤ
110・・・スリット円板(回転板)
111・・・連結部材
111a・・・円筒部
111b・・・鍔部
111c・・・テーパ部
112・・・押え部材
113・・・センサ(検出手段)
113a・・・信号線
113b・・・コネクタ
114・・・検出手段支持部材
114a・・・センサ係合部
114b・・・凸部
114d・・・軸貫通部
114f・・・テーパ部
115・・・ケーシング部材
115a・・・凸部
115b・・・軸貫通部
120・・・ケーシング(ケース部材)
121・・・スリット
130a,130b・・・ネジ
131・・・ネジ
DESCRIPTION OF SYMBOLS 1 ... Photosensitive drum 10 ... Housing 11 ... Drive bracket 100 ... Rotation information detection apparatus 101 ... Drive shaft (rotation shaft)
102 ... Ball bearing (bearing)
DESCRIPTION OF SYMBOLS 103 ... Motor 104 ... Pinion gear 105 ... Motor bracket 106 ... Large diameter gear 110 ... Slit disk (rotary plate)
111 ... connecting member 111a ... cylindrical part 111b ... collar part 111c ... taper part 112 ... pressing member 113 ... sensor (detection means)
113a ... Signal line 113b ... Connector 114 ... Detection means support member 114a ... Sensor engaging part 114b ... Convex part 114d ... Shaft penetration part 114f ... Tapered part 115 ... Casing member 115a ... convex part 115b ... shaft penetration part 120 ... casing (case member)
121 ... Slits 130a, 130b ... Screw 131 ... Screw
Claims (10)
前記位置情報を読み取り、前記回転情報形成部材の回転情報を検出する検出手段と、
前記回転軸に直接又は軸受を介して嵌合する嵌合基部及び前記検出手段を支持する支持部を一体に備える検出手段支持部材と、
を有することを特徴とする回転情報検出装置。 A rotation information forming member provided on the rotation shaft and forming position information for detecting rotation information of the rotation shaft;
Detection means for reading the position information and detecting rotation information of the rotation information forming member;
A detecting means supporting member integrally comprising a fitting base portion that fits directly or via a bearing on the rotating shaft and a supporting portion that supports the detecting means;
A rotation information detecting device comprising:
前記連結部材の回転軸への取付穴の開口部には勾配を形成したことを特徴とする請求項1乃至3のいずれか記載の回転情報検出装置。 The rotation information forming member includes a connecting member that couples the rotation information forming member to the rotation shaft to rotate with the rotation shaft,
The rotation information detecting device according to any one of claims 1 to 3, wherein a gradient is formed in an opening portion of the attachment hole to the rotation shaft of the connecting member.
前記ケーシング部材と回転軸との間に所定間隔の隙間を備え、前記連結部材の一部を回転軸とケーシング部材の隙間より突出させ、
連結部材の突出した部分において、連結部材を回転軸に固定することを特徴とする請求項1乃至4のいずれか記載の回転情報検出装置。 A casing member that is combined with the detection means support member and encloses the detection means and the rotation information forming member between the detection means support member,
A gap having a predetermined interval is provided between the casing member and the rotating shaft, and a part of the connecting member is protruded from the gap between the rotating shaft and the casing member.
The rotation information detecting device according to any one of claims 1 to 4, wherein the connecting member is fixed to the rotating shaft at a protruding portion of the connecting member.
An image forming apparatus comprising the rotation information detecting device according to claim 1.
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